Trivalent Chromium Blue Zinc Passivation liquid

Product Overview

Description

   

 

                Trivalent Chromium Blue Zinc Passivation  

1. Advantages

  1)Completely no Cr⁶⁺, can meet the products requirement for exporting to Europe, America, Japan etc.

  2) Corrosion- resistance ability of the blue passivative film is excellent, can pass neutral salt spray test (NSS test) for 72 hours .

  3)Suitable for all kinds of rack plating or barrel plating production lines for acid zinc and alkaline zinc, can be used in normal temperature.

  4)  Passivation liquid can be used for long time, no need to change the passivation liquid constantly, only supplement according to consumption.

 

 2. Bath Composition and Working Conditions                                                        

 

Item	range	optimum
blue zinc liquid HN-68	80-120 ml/L	100ml/L
temperature	25-35°C	30°C
time for passivation	15-30 Sec.	20 Sec.
PH value	1.8-2.2	2.0
agitation	mechanical agitation or air agitation

 

3.Maintenance

 1)  It is need to use sodium hydroxide to adjust the pH value to 2.0 when the first time for making up.

2)  In the production process, the color of the passivation film will be yellowish if the pH value is too high. You can adjust by adding blue zinc liquid NH-68 or nitric acid.

3)  If you need more blue color, you can use shorter time or lower pH value for passivation. If you need better corrosion- resistance ability, you can use longer time for passivation.

 

 

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